2002A&A...385..412M


Query : 2002A&A...385..412M

2002A&A...385..412M - Astronomy and Astrophysics, volume 385, 412-424 (2002/4-2)

Radio continuum and CO emission in star-forming galaxies.

MURGIA M., CRAPSI A., MOSCADELLI L. and GREGORINI L.

Abstract (from CDS):

We combine the radio continuum images from the NRAO VLA Sky Survey with the CO-line observations from the extragalactic CO survey of the Five College Radio Astronomy Observatory to study the relationship between molecular gas and the star formation rate within the disks of 180 spiral galaxies at 45" resolution. We find a tight correlation between these quantities. On average, the ratio between the radio continuum and the CO emission is constant, within a factor of 3, both inside the same galaxy and from galaxy to galaxy. The mean star formation efficiency deduced from the radio continuum corresponds to convert 3.5% of the available molecular gas into stars on a time scale of 108yr and depends weakly on general galaxy properties, such as Hubble type or nuclear activity. A comparison is made with another similar analysis performed using the Hα luminosity as star formation indicator. The overall agreement we find between the two studies reinforces the use of the radio luminosity as star formation rate indicator not only on global but also on local scales.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: spiral - ISM: molecules - stars: formation

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3344 2
2 NGC 520 AG? 01 24 34.90 +03 47 29.4 12.41 12.24 11.42     ~ 514 3
3 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5847 1
4 NGC 660 Sy2 01 43 02.350 +13 38 44.45   12.02 11.16     ~ 557 2
5 NGC 1055 GiP 02 41 45.233 +00 26 35.45 11.59 11.40 10.59 10.5 10.7 ~ 283 2
6 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4610 2
7 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1518 1
8 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 723 2
9 NGC 2655 Sy2 08 55 37.731 +78 13 23.10   12.03 11.08     ~ 297 2
10 NGC 2841 LIN 09 22 02.6778711696 +50 58 35.737082868 10.43 10.09 9.22     ~ 1073 1
11 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5869 6
12 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1393 3
13 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 774 1
14 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 821 1
15 NGC 3521 G 11 05 48.5680991376 -00 02 09.245076540 10.06 9.83 9.02 10.1 9.6 ~ 817 2
16 NGC 3628 GiP 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 829 3
17 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3698 2
18 NGC 4302 GiP 12 21 42.477 +14 35 51.94   13.4 11.61     ~ 329 0
19 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1847 2
20 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1347 2
21 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6660 0
22 IRAS 12315+0758 GiG 12 34 03.029 +07 41 56.90   10.6       ~ 674 0
23 NGC 4535 H2G 12 34 20.3443516704 +08 11 51.908488116   11.1       ~ 618 0
24 NGC 4710 H2G 12 49 38.958 +15 09 55.76   11.6       ~ 313 0
25 NGC 4866 LIN 12 59 27.0952921176 +14 10 16.382228232   11.9       ~ 211 0
26 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2580 2
27 NGC 5247 GiG 13 38 03.0183262176 -17 53 02.645511252   10.77   9.96 10.5 ~ 220 0
28 NGC 6503 LIN 17 49 26.4207792072 +70 08 39.604132176 11.56 10.95 10.28 9.92   ~ 521 1
29 NAME Local Group GrG ~ ~           ~ 8415 0

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